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Superfund Site Report: SAN GABRIEL VALLEY (AREA 4)
  • Map Locating Superfund Site
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  • Site Description
    Stage of Clean-up: Design Underway

    Conditions at listing (September 1983): San Gabriel Valley (Area 4) is a ground water plume that runs along the axis of the San Jose Creek in the San Gabriel ground water basin in La Puenta, Los Angeles County, California. The plume is about 1 mile long and 1 mile wide. Ground water is contaminated with TRICHLOROETHYLENE (TCE) and PERCHLOROETHYLENE (PCE), according to analyses by State agencies and local water companies. Many public wells in the area exceed the EPA Suggested No Adverse Response Levels (SNARL) for TCE and PCE. Approximately 100,000 people are affected. Cities and public water companies in the area have tested to ENSURE that their water supplies contain less than 5 parts per billion (ppb) of TCE, a level considered safe for human consumption. When alternative methods of reducing the TCE level below 5 ppb are not effective, wells are removed from service.  More...

    Sources of Contamination:
    • Dumping - unauthorized
    • Inadvertent spill
    • Landfill
    • Manufacturing process
    • Storage - drums/containers of waste
    • Waste tank - above ground
    • Waste tank - below ground
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  • Threats and Contaminants
    Groundwater and soil are contaminated with various VOCS. People in the San Gabriel Valley may be exposed to contaminants in groundwater and soil through drinking, bathing, or cooking. People who inhale vapors from groundwater that contain VOCS could be exposed to hazardous substances. Currently, all drinking water provided meets Federal and State drinking water standards.

    Contaminants Detected

    Air Soil Other

    Groundwater and Drinking Water

    Were drinking water wells shut down due to contamination? Yes
    Population served by the wells now shut down: > 100,000
    Are drinking water wells potentially threatened? Yes
    Population served by the threatened wells: > 100,000
    Aquifer discharges into: A drinking water aquifer
      Surface water
    Population served by water wells in the aquifer: > 100,000
    List ground water uses.
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  • Pre-Cleanup Rankings
    EPA Hazard Ranking System scores for SAN GABRIEL VALLEY (AREA 4):

    Less Hazard National Average More Hazard
    0%         50%         100%

    Overall site:
    Ground water migration:

    Rank Superfund sites in the U.S., CALIFORNIA, or in LOS ANGELES County by EPA Hazard Ranking Scores.

    *Note: EPA's Hazard Ranking System is designed to screen and prioritize sites for the Superfund program, based on limited data available at time of listing. These scores are not based on a comprehensive risk assessment of the site and do not reflect conditions after initiation of cleanup work.
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  • Site Information
    EPA ID: CAD980817985
    LA PUENTE, CA 91744
    Site Ownership: Mixed Ownership
    Category of Site: Groundwater
    Date of Final Listing on the NPL: May 08, 1984
    List Standard Industrial Classifications (SIC) associated with current and past activities at the SAN GABRIEL VALLEY (AREA 4) Superfund site.
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  • Potentially Responsible Party (PRP) Involvement
    Number of PRPs currently associated with this site: 240
    Hazardous waste received from off-site generators/transporters? No
    Number of owners/operators which are also municipalities: 0

    List Potentially Responsible Parties identified by U.S. EPA as associated with the SAN GABRIEL VALLEY (AREA 4) Superfund site.
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